Speaking of PCB, I believe we all feel it everywhere in our lives, almost all household appliances from various parts within the computer, to a variety of digital products, electronic products, as long as it is almost always used PCB. The circuit board by a single layer and multilayer boards classification points, each ply is a superposition of layers formed by the copper foil circuit, it turned out to be superposed, that is how the communication between the board layers, in an industry here extended word called vias, that manufacturing a circuit board using a drill to be communicated with different layers of a circuit, for the purpose of communication is conductive, so called vias pcb proofing, for must be a conductive plating on a surface of another layer of conductive material which borehole the electrical commonly used material is copper, by this production process, electrons can move between the different layers of copper foil. 
Well, PCB proofing vias and what classification it?
The first circuit board is a through-hole A proofing pcb vias are of common usage, to direct the light, the light can be seen through hole is a hole through the pcb. This is a relatively simple proofing pcb hole, the production process using a drill or a laser beam directly to the circuit board to make the whole drilling. Costs are also relatively inexpensive, however, the through-hole is cheap, but often more than use up some of the pcb space.
The second proofing pcb is a blind hole, that is, the outermost layer circuit pcb adjacent plated holes connected to the inner layer, can not see the opposite, it is described as a blind hole pcb proofing also common use. To increase the space utilization pcb circuit layer, the process will have a blind hole. Note that, pcb proofing this manufacturing method requires special attention to the depth of the borehole to be just right, can advance to the circuit layer at the time of communication needs individual circuit layer on the first-drilled, and finally bonding them, but need to compare precision positioning and alignment device.
The third hole is buried pcb, any circuits connected to the internal PCB layer to the outer layer but not conductive. This process can not reach the adhesive used in the drilling mode, the drilling must be executed when the individual circuit layers, after the plating process must first inner layer to the local bonding, and finally to full bonding, compared to the above through hole and the blind way more labor-hole, so its price is expensive. Because this process is typically used only in the high density circuit board, to increase the available space for other circuit layers.
With the development of electronic products to "light, thin, short, small" direction, but also to high-density PCB, difficult development, and therefore a large number of SMT, BGA PCB's, and mount components to customer requirements in the plug hole, why PCB PCB vias must plug the hole? As a timely response to customer requirements, and then after a lot of practice, change the traditional aluminum jack technology, complete line Ban Ban solder and plug hole with a white net, so to produce more stable, quality and more secure.
Czech Multi-State PCB always adhere to the superb technology, sophisticated production equipment, improve the detection means, higher than the industry standard of product quality, warm and thoughtful service, has won global businesses and users of praise and welcome.
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